/*******************************************************************************
 * Copyright (c) 2004, 2005 Elias Volanakis and others.
�* All rights reserved. This program and the accompanying materials
�* are made available under the terms of the Eclipse Public License v1.0
�* which accompanies this distribution, and is available at
�* http://www.eclipse.org/legal/epl-v10.html
�*
�* Contributors:
�*����Elias Volanakis - initial API and implementation
�*******************************************************************************/
package eu.hydrologis.jgrass.formeditor.parts;

import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPartFactory;

import eu.hydrologis.jgrass.formeditor.model.Connection;
import eu.hydrologis.jgrass.formeditor.model.AWidget;
import eu.hydrologis.jgrass.formeditor.model.WidgetsDiagram;

/**
 * Factory that maps model elements to edit parts.
 * @author Elias Volanakis
 */
public class WidgetEditPartFactory implements EditPartFactory {

    /*
     * (non-Javadoc)
     * @see org.eclipse.gef.EditPartFactory#createEditPart(org.eclipse.gef.EditPart, java.lang.Object)
     */
    public EditPart createEditPart( EditPart context, Object modelElement ) {
        // get EditPart for model element
        EditPart part = getPartForElement(modelElement);
        // store model element in EditPart
        part.setModel(modelElement);
        return part;
    }

    /**
     * Maps an object to an EditPart. 
     * @throws RuntimeException if no match was found (programming error)
     */
    private EditPart getPartForElement( Object modelElement ) {
        if (modelElement instanceof WidgetsDiagram) {
            return new WidgetsDiagramEditPart();
        }
        if (modelElement instanceof AWidget) {
            return new WidgetEditPart();
        }
        if (modelElement instanceof Connection) {
            return new ConnectionEditPart();
        }
        throw new RuntimeException("Can't create part for model element: "
                + ((modelElement != null) ? modelElement.getClass().getName() : "null"));
    }

}